class Conversation(object):
    def __init__(self):
        self.session_id = ''
        self.chat_id = ''
        self.question = ''
        self.question_type = ''
        self.asked_at = ''
        self.reply_time = ''
        self.robot_answer = {
            'answer': '',
            'answer_type': '',
            'knowledge': ''
        }
